Am i missing something without a power conditioner?


I need your advice on power conditioners. I know there is alot talked about with power conditioners. But let me explain my situation and what i have. First and foremost i upgraded all my stock power cords. I am using and have a Krell FPB 600 amp with a Shunyata Research Sigma HC power cord. I am using and have an Audio Research Ref 6 preamp with a Shunyata King Cobra Helix CX power cord. And have a Rega ISIS cd player with a Shunyata Sigma digital power cord. I have 1 dedicated 20 amp line with a 4 plug 20 amp wall outlet that my amp and preamp plug into. My question is with these high quality power cords do i still need a power conditioner? 
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Maybe i will put a dedicate 15a circuit for my cd player just for the hell of it. But as of right now i cant see me spending about 4-5 grand in used Shunyata conditioners not including about 2 grand in power cords. Seriously my system sounds crystal clear. 
does the Elgar give you any protection for surge, like a close lightning strike?
Yes.
My system has all digital source components (stream Tidal on a Windows10 Pro machine, music server and CD/SACD transport) and external DACs.  When I upgraded from a Furman power conditioner to a PS Audio P10 power regenerator (which removes most of the "distortion" in the AC power), I noticed an immediate improvement in the SQ from my DAC.

I can't speak to if improved power would improve a system with analog sources, but I suspect it would be a good upgrade for that as well.